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Clearly, the Undying Flames were an attack, a specific type of attack targeting the Pale Origin, another immortal plant creature. Only perpetual burning could restrain infinite growth, ensuring it remained in a state neither alive nor dead. Such a feat could only be achieved by someone of the Saint Fist rank.
There was a Saint Fist in existence who, in the distant past, confronted the Pale Origin. He discovered a way to counter the Pale Origin, releasing the eternal burning Undying Flames. These flames likely shared a profound similarity with the boundlessly increasing qi of the Saint Fist, specifically designed to sustain prolonged battles against formidable enemies.
Once afflicted by this technique, the Pale Origin was essentially crippled. Its continuously growing vitality, size, and strength were consumed by the flames. Forever it could only maintain a balance, its condition drastically diminishing.